#include "mbed.h$"$

#define TOGGLE$\_$CMD $\text{'}t\text{'}$

#define FIRST$\_$BOARD

$//$ #define SECOND$\_$BOARD

uint$8\_$t serTxData;

uint$8\_$t serRxData;

static serialPort $($PD$\_5,$ PA$\_3{?}^3$;

$(1)$

#ifdef FIRST$\_$BOARD

userButton $()$; $(2)$

void transmitTrigger$()\{$

serTxData $=$ TOGGLE$\_$CMD;

$\}$

int main$()$

$\{$

serialPort.

userButton.

enable$\_$irq$()$;

while $($true$)$

f

$\}$

$\}$

#endif